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Scabrethia
Family:
Asteraceae
Max Licher
FNA
Resources
William A. Weber in Flora of North America (vol. 21)
Perennials,
20-60 cm (taproots often relatively massive; caudices unbranched or multibranched).
Stems
erect, seldom branched (usually white in age).
Leaves
mostly cauline (proximal scalelike); mostly alternate, sometimes opposite; sessile or nearly so; blades (mid and distal, usually 1 or ± 3-nerved, laterals weaker than midribs) narrowly oblong to linear, bases ± cuneate, margins entire, faces hispid to scabrous, glabrescent (then usually roughened by persistent hair bases).
Heads
radiate, borne singly (peduncles sometimes bracteate).
Involucres
hemispheric to turbinate, (13-)20-30(-40) mm diam.
Phyllaries
persistent, 30-45+ in 3-4+ series (subequal to unequal, outer often surpassing inner).
Receptacles
flat to convex, paleate (paleae conduplicate, papery).
Ray florets
(8-)10-18(-21), pistillate, fertile; corollas yellow.
Disc florets
40-120+, bisexual, fertile; corollas yellow, tubes much shorter than cylindric throats, lobes 5, ± deltate (style branches stigmatic in 2 barely distinct lines, appendages filiform).
Cypselae
± prismatic, (3-)4-angled (faces glabrous, smooth or finely honeycombed);
pappi
persistent, coroniform, ± lacerate.
x
= 19.
Scabrethia scabra
Map not
Available